Machine fob cleaning grain



T. MCCREA.

' Grain Cleaner.

No. 1,280. Patented Aug. 9, 1839.

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NITED STATES PATENT OFFICE.

THOMAS MGCREA, OF ELLIGOTTS MILLS, MARYLAND.

MACHINE FOR CLEANING GRAIN.

Specification of Letters Patent No. 1,280, dated August 9, 1839.

T0 all whom it may concern.'

Be it known that I, THOMAS MCOREA, of Ellicotts Mills, Anne Arundelcounty, and State of Maryland, have invented a new and useful Mode ofCleaning Vheat and other Small Grain in Mills.

The nature of my improvement consists in providing that part of the millmachinery usually allotted t0 the cleaning of grain with two circularcast iron plates placed horizontally one above the other the lower platestationary-the upper plate in motion both plates furnished with circularrows of pyramidal teeth, so arranged that when in motion, the teeth ofone plate run between the teeth of the other plate and thus subject thegrain to a thorough process of rubbing. By this arrangement and motion acurrent of air is produced, which separates and carries 0H the dust andwhite caps in a proper direction and the grain is consequently deliveredat the spout thoroughly rubbed and cleaned.

To enable others skilled in the art to make and use my invention, Iproceed to describe its construction and operation with reference to thedrawings hereto annexed.

To construct the frame zr-b c cZ (see Figures 1 2 3) are four uprightposts, joined together at top by the four cross ties ab ccl c da (Figs.1 8) and by the plumber block c F joined also at the mid! dle by fourcross ties mf-n (Figs. 1 2) which form a bearer for the bed plate, andat bottom by two cross ties gL gz. (Fig. l). Two upright bridge posts I7c-47e (Figs. 1 2) support the bridge to which they are joined at Z-Z(Fig. 1.)

To construct the machinery on the four cross ties at fm, n 7 which formthe bearer, I fasten a circular cast iron bed plate C D (Figs. 7 9)which is perforated in its center at 'Q/ z to admit the spindle. Beingprovided with the spindle g/ z (Fig. 6) I fasten to its neck with awrought iron driver the circular cast iron plate A B (Figs. 4, 5, 7)which acts as the runner. The plates A B and C D are each provided withcircular rows of pyramidal teeth of cast iron sloping circularly towardthe edge and at the same time toward the apex. The teeth of one plateare pointed in a direction opposite' to the teeth of the other plate asis represented on Fig. 7 `in which the teeth of the lower plate arerepresented by whole lines, and those of the upper plate by dotted linesin the quadrant A B. The runner A B is furnished with a small hoop ofsheet iron at E E (Figs 4 5-6) to receive the grain. The spindle is alsoprovided with two pulleys, one at u o and one at w m (Figs. 1 2-45). Thespindle is then inserted into the frame, the top gudgeon being fittedinto the plumber block e F by a confiner at y (Fig. 2) and the toeresting in the step fitted on the bridge Z Z. The plates are thencovered with the hoop 0 2? (Figs. 1 8). This hoop is made of sheet iron,is divided into two parts, fastened together at T g so as to be easilyremoved when required, and provided with an aperture at s at which thegrain is delivered when rubbed and cleaned. At the top of the hoop isanother aperture in which is inserted the end of a spout, which spout isconnected with a wheat fan placed at any convenient point. 7When themachinery and the fan is in motion, the dust and white caps areseparated by the current of air and carried olf through this spout.

To drive the machinery a strap is attached to the pulley u c whichconnects with any convenient part of the mill machinery, and at the sametime a strap around the pulley w .fr drives the fan. The necessarynumber of teeth in the runner is ninety six; in the bed plate eightyeight. Their shape is pyramidal, sloping circularly toward the edge andat the same time toward the apex. They are made 2iinches long, by :2gwide, and three fourths of an inch thick at their base. Thickness ofplates one inch-diameter three feet-revolutions of the runner 300 perminute.

In the drawings-Fig. l presents, the perspective view F ig. 2 thevertical projection Fig. 8 the horizontal proj ection-Fig. 4 verticalprojection of machinery Fig. 5 horizontal projection of the runner-Fig.6 oblique view of both plates F ig. 7 circular horizontal projection ofthe lower or bed plate, containing a dotted quadrant of the upper plateor runner-Fig. 8 perspective view of the hoop-Fig. 9 vertical projectionof both plates.

I do not claim as my invention the two cast iron circular and horizontalplates armed with teeth acting over each other, as this is not new.

What I do claim is The method of arranging t-he teeth of the two castiron circular horizontal plates, so that the teeth of the upper plateshall revolve between those of the lower plate as herein described.

THOMAS MCOREA.

Witnesses:

JAMES LEA, AMBRosE B. OWENS.

